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Change time at which Nodepool refresh the images
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Description

Nodepool refreshes the images at 14:14 UTC (16:14 CEST 7:14 PST):

modules/nodepool/templates/nodepool.yaml.erb
cron:
  image-update: '14 14 * * *'

Once the new image is ready, instances will start being created out of it. However it takes a while to transfer the new image from glance to the compute node and that introduce a noticeable delay (5 - 6 minutes). That is potentially annoying when one CR+2 or send a patch at that time.

We should regenerate them at a different time. Ideally when there is not much traffic and we are around to roll back to previous version.

While at it, it is regenerated every day. Maybe we want to avoid Friday and week-end.